Looks nice, but I was wondering if you could make it so that pipes don't disappear instantly at the end of the screen and instead gradually disappear into the edge? JWinslow's game had the opposite problem: Pipes appeared instantly to the right. 
Also maybe make it scroll at 2 pixels intervals so it's faster.
I concur with the DJ.
Seriously, are you redrawing the screen each frame still, or did you change that? Because if you did change it, you can just add some If conditionals in order to draw only part of the pipe as it's leaving the frame. That's what I did with mine.
Also, it just seems a little slow to me, too. Scroll it faster, maybe?
